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Offline oscampo  
#1 Posted : 18 September 2023 17:31:30(UTC)
oscampo


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Here is a problem I found trying to solve a simple engineering question.


NoSolution.png

Please see attached file: Problem with solvers.sm (91kb) downloaded 11 time(s).

Edited by user 20 September 2023 21:56:52(UTC)  | Reason: Not specified

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Offline overlord  
#2 Posted : 19 September 2023 03:17:56(UTC)
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Sorry I don't have maxima.
Equations are solved with FindRoot().

I also had to make some alterations.
Original y(x) function has unit mismatch.
Solvers don't like direct usage of if() or cases().
You can detect it with Unknowns().
If it doesn't produce a result, there is a problem.

Here is your file solved.

Regards

Problem with solvers_solved.sm (96kb) downloaded 12 time(s).
thanks 5 users thanked overlord for this useful post.
on 19/09/2023(UTC),  on 19/09/2023(UTC),  on 19/09/2023(UTC),  on 19/09/2023(UTC),  on 19/09/2023(UTC)
Offline overlord  
#3 Posted : 20 September 2023 02:53:43(UTC)
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I assumed C.1 and C.2 has same units.
Maybe I was wrong at that conclusion.
Worksheet below find a solution between 4-6.
This may be the correct result.
Sorry if I made a huge mistake.

Regards

Problem with solvers_revisited.sm (106kb) downloaded 10 time(s).

Click to enlarge

Edited by user 20 September 2023 02:56:38(UTC)  | Reason: Not specified

thanks 2 users thanked overlord for this useful post.
on 20/09/2023(UTC),  on 20/09/2023(UTC)
Offline oscampo  
#4 Posted : 20 September 2023 03:24:06(UTC)
oscampo


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Perfect! Thanks for your cooperation!
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